A top aide to Donald Trump said on Sunday he did not believe a report that the billionaire once posed as his own spokesman to brag about his personal life to a celebrity magazine.

The Washington Post released an audio recording on Friday of a man who identified himself as Trump’s publicist, “John Miller,” and talked about the billionaire’s romantic encounters during a conversation with a People Magazine reporter in 1991.

After listening to the tape while appearing on CNN’s “State of the Union” show, senior Trump adviser Paul Manafort said he did not believe it was the Republican frontrunner’s voice.

Trump told NBC’s “Today” show on Friday that the voice was not his, although he has admitted in years past to using at least one pseudonym to speak to reporters.

The original People Magazine article that ran in 1991 winkingly described Miller as “a mysterious PR man who sounds just like Donald.”

Within a few days of that article, Sue Carswell, the People reporter who originally made the recording, reported that Trump had admitted that he posed as Miller as a joke and had apologized for it.

Trump effectively locked up his party’s nomination earlier this month to run in the November 8 presidential election and has been working to try to unify the Republican Party behind him.

The recording quickly rippled through American media and on Saturday the popular comedy program Saturday Night Live, satirized the recording, having an actor posing as Trump calling reporters pretending to be his own spokesman.

Leading Democratic presidential candidate Hillary Clinton’s allies have described Trump as “deceptive” and homed in on his treatment of women. Clinton has begun attacking Trump more aggressively since he secured the nomination, deriding his character and recently suggesting that he’s hiding something by not releasing his tax returns.

The recording featured some phrases and speech patterns that are commonly used by Trump, including saying “he’s starting to do tremendously well financially” and use of the word “frankly,” which Manafort dismissed as likely to be adopted by people who work for him.

“The justification for the tape is … words that are on that tape are words that Donald Trump uses,” Manafort said. “I have been working for Donald Trump for six weeks. I’m using words he uses.”

Trump’s willingness to pose as a fake spokesman was first reported in 1990, when he testified under oath as part of a lawsuit that he had used the pseudonym John Baron, sometimes rendered in news reports as John Barron, when speaking to journalists by telephone.

“Lots of people use pen names,” Newsday quoted him as saying after his testimony. “Ernest Hemingway used one.”

(Reporting by Ginger Gibson; Additional reporting by Jonathan Allen in New York; Editing by Greg Mahlich and Alan Crosby)